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GAO discussed the importance of computer security and hacker information available on the Internet. GAO noted that: (1) hackers pose a national security risk when they break into Department of Defense computer systems and steal or destroy sensitive data; (2) information on hacker tools and techniques is available on the Internet and searches for such information are relatively easy; (3) numerous hacker groups provide information and user-friendly tools on breaking into phone and computer systems, obtaining sensitive files, and implanting computer viruses; and (4) risks of disruption and damage to sensitive computer systems from hackers will continue as more federal agencies and private companies rely on the Internet and information on hacker techniques becomes more readily available.